US20050130699A1 - Antenna impedance matching device and method for a portable radio telephone - Google Patents
Antenna impedance matching device and method for a portable radio telephone Download PDFInfo
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- US20050130699A1 US20050130699A1 US11/039,881 US3988105A US2005130699A1 US 20050130699 A1 US20050130699 A1 US 20050130699A1 US 3988105 A US3988105 A US 3988105A US 2005130699 A1 US2005130699 A1 US 2005130699A1
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- antenna
- matching
- voltage
- impedance
- casing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B1/0458—Arrangements for matching and coupling between power amplifier and antenna or between amplifying stages
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/44—Details of, or arrangements associated with, antennas using equipment having another main function to serve additionally as an antenna, e.g. means for giving an antenna an aesthetic aspect
- H01Q1/46—Electric supply lines or communication lines
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/18—Input circuits, e.g. for coupling to an antenna or a transmission line
Definitions
- the present invention relates to a device for matching an antenna impedance in a portable radio telephone, and more particularly, to a device for matching an antenna impedance in a portable radio telephone, for maintaining an optimal antenna impedance matching state.
- the portable radio telephone of a folder type is provided with an upper casing and a lower casing for protecting a display and a keypad. Since an antenna related impedance is varied with the state of the casing, (i.e., a folded or closed state and an unfolded or open state), the radio performance characteristics also vary. That is, the radio performance of the portable radio telephone is dependent on the state of the casing.
- An example of such a portable radio telephone is disclosed in U.S. Pat. No. 5,335,368, wherein a portable radio telephone having a casing is disclosed which maintains a matched state for the antenna impedance in a call waiting state and in an operating state.
- the portable radio telephone is provided with an upper casing and a lower casing foldably coupled to a body by hinges, a matching circuit between the antenna and a transmitting-and-receiving circuit, and a sensor (a switch) for sensing states (folded or unfolded) of the upper casing and the lower casing for changing an impedance matching state according to a power provided to the sensor.
- sensors switched mechanically are used for sensing folding and unfolding of the upper casing and the lower casing and matching an impedance of the antenna. Therefore, the sensor is sensitive to mechanical defects, and no antenna related impedance matching dependent on the casing state is possible if mechanical defects occur.
- the antenna impedance matching in the related art cannot match the antenna impedance optimally for both when the antenna is extracted and when it is retracted.
- the antenna impedance matching in the related art only by sensing the casing state cannot match the antenna impedance optimally for both a reception and a transmission mode.
- the present invention is directed to a device for matching an antenna impedance in a portable radio telephone that substantially obviates one or more of the problems due to limitations and disadvantages of the related art.
- An object of the present invention is to provide a device for matching an antenna impedance in a portable radio telephone of a folder type, or a type similar to the folder type, in which an operating mode, a casing state, and an antenna state of the portable radio telephone are detected for matching an optimal antenna related impedance according to respective states.
- the device for matching an antenna impedance in a portable radio telephone includes a folder sensor for sensing a folded state or an unfolded state of the folder casing, a controller for controlling a voltage according to a casing state sensed at the folder sensor, and a matching circuit having a variable capacitance diode for matching an impedance of the antenna and an impedance of a transmission/reception circuit according to the voltage of the controller.
- a device for matching an antenna impedance in a portable radio telephone including a radio having transmission and reception circuits, an antenna movable between an extracted position from the telephone and a retracted position into the telephone, means for sensing the extracted or retracted state of the antenna to provide a sensing signal, a controller for providing voltages different from one another in response to the sensing signal from the means, and means for matching an impedance of the antenna and an impedance of the radio according to the voltages from the controller.
- a device for matching an antenna impedance in a portable radio telephone including a radio having transmission and receiving circuits, a foldable casing enclosing the radio, the foldable casing movable between an unfolded position and a folded position, an antenna movable between an extracted position from the foldable casing and a retracted position into the foldable casing, means for sensing whether the foldable casing is in the unfolded position and for sensing whether the antenna is in the extracted position, and for providing a sensing signal in response thereto, and means for matching an impedance of the antenna and an impedance of the radio in response to the sensing signal.
- a device for matching an antenna impedance in a portable radio telephone including a radio having transmission and receiving circuits, a foldable casing enclosing the radio, the foldable casing movable between an unfolded position and a folded position, an antenna movable between an extracted position from the foldable casing and a retracted position into the foldable casing, means for sensing whether the foldable casing is in the unfolded position and for sensing whether the antenna is in the extracted position, and for providing a sensing signal in response thereto, a measure for providing a RF signal to the antenna, or measuring a RF signal from the antenna, a controller for controlling the measure to provide the RF signal to the antenna in a reception mode and to measure the RF signal from the antenna in a transmission mode, and for determining optimal antenna impedance matching values for respective modes and folder casing and antenna states and storing the optimal matching values, and means for matching an impedance of the antenna and an impedance of
- FIG. 1 illustrates a block diagram of a device for matching an antenna impedance in a portable radio telephone in accordance with a first preferred embodiment
- FIG. 2 illustrates a detailed system of the digital-to-analog converter (DAC) in FIG. 1 ;
- FIG. 3 illustrates a detailed system of the matching circuit in FIG. 1 ;
- FIG. 4 illustrates a detailed system of the matching circuit in FIG. 1 in accordance with a second preferred embodiment
- FIG. 5 illustrates an outer appearance of a portable radio telephone in accordance with a first preferred embodiment
- FIG. 6 illustrates a block diagram of a device for matching an antenna impedance in a portable radio telephone in accordance with a second preferred embodiment
- FIG. 7A illustrates an outer appearance of a device for matching an antenna impedance in a portable radio telephone in accordance with a second preferred embodiment
- FIG. 7B illustrates a circuit of the CPU and the antenna sensor in FIG. 7A ;
- FIG. 8 illustrates a block diagram of a device for matching an antenna impedance in a portable radio telephone in accordance with a third preferred embodiment
- FIG. 9 illustrates a block diagram of a device for matching an antenna impedance in a portable radio telephone in accordance with a fourth preferred embodiment
- FIG. 10 illustrates a flow chart showing a first embodiment method for storing an optimal antenna impedance matching value in accordance with a fourth preferred embodiment
- FIG. 11 illustrates a flow chart showing a second embodiment method for storing an optimal antenna impedance matching value in accordance with a fourth preferred embodiment.
- FIG. 1 illustrates a block diagram of a device for matching an antenna impedance in a portable radio telephone in accordance with a first preferred embodiment.
- the device for matching an antenna impedance in a portable radio telephone in accordance with a first preferred embodiment includes an antenna 10 , a folder sensor 20 , a central processing unit (CPU) 30 , a Digital-to-Analog Converter (DAC) 40 , a matching circuit 50 , transmission/reception circuit 60 , and a non-volatile memory 31 .
- the antenna 10 receives a radio wave signal from the air and provides the signal to a matching circuit 50 , or transmits a signal from the matching circuit 50 to the air.
- the folder sensor 20 has a permanent magnet and a magnetic sensor for sensing a folded or unfolded state of a casing of the portable radio telephone, and communicating the state to the CPU 30 .
- the non-volatile memory 31 stores a voltage value corresponding to a state of the folder sensor, and the CPU 30 reads the stored voltage value from the non-volatile memory 31 according to a state that the folder sensor 20 senses.
- the DAC 40 converts a voltage from the CPU 30 into analog signal for controlling matching of the matching circuit 50 .
- a detailed embodiment of the DAC is illustrated in FIG. 2 .
- the DAC has a variable pulse generator, which may be a Pulse Width Modulator (PWM) or a Pulse Density Modulator (PDM), for receiving a control signal and a data signal from the CPU 30 and varying a pulse width or a pulse density, and a integrating circuit 42 having a resistor R and a capacitor C for integrating a signal from the variable pulse generator 41 and providing it to the matching circuit 5 .
- PWM Pulse Width Modulator
- PDM Pulse Density Modulator
- the matching circuit 50 is directly connected to the antenna 10 for performing impedance matching when a transmission/reception signal is transmitted between the antenna 10 and the transmission/reception circuit 60 .
- the transmission/reception circuit 60 processes a signal received through the matching circuit 50 , or provides a signal to the antenna 10 through the matching circuit 50 .
- FIG. 3 illustrates a detailed system of the first embodiment matching circuit in FIG. 1 .
- the matching circuit 50 comprises a ‘ ⁇ ’ circuit, inclusive of an inductor L 1 between the antenna 10 and the transmission/reception circuit 60 , a first capacitor C 1 connected between the transmission/reception circuit 60 /inductor L 1 and ground, and a second capacitor C 2 and a variable capacitance diode, or varactor, C 3 connected in series between the antenna 10 /inductor L 1 and ground.
- the DAC 40 is connected between the second capacitor C 2 and the variable capacitance diode, or varactor, C 3 . Therefore, a capacitance of the variable capacitance diode, or varactor, C 3 is varied with a control voltage from the DAC 40 .
- FIG. 4 illustrates a detailed system of the second embodiment of the matching circuit 50 in FIG. 1 .
- the matching circuit 50 comprises a ‘ ⁇ ’ circuit, inclusive of an inductor L 1 between the antenna 10 and the transmission/reception circuit 60 , a first capacitor C 1 connected between the transmission/reception circuit 60 /inductor L 1 and ground, and a second capacitor C 2 and a variable capacitance diode, or varactor, C 3 each respectively connected between the antenna 10 /inductor L 1 and ground.
- the DAC 40 is connected between the inductor L 1 and the variable capacitance diode, or varactor, C 3 . Therefore, a capacitance of the variable capacitance diode, or varactor, C 3 is varied with a control voltage from the DAC 40 .
- FIG. 5 illustrates an outer appearance of a portable radio telephone in accordance with a first preferred embodiment.
- the outer appearance of a portable radio telephone in accordance with a first preferred embodiment of the present invention shows an upper casing 71 and a lower casing 72 , both of which are foldably coupled with a hinge 73 .
- Positions of the reception speaker 74 , the transmission speaker 75 , the antenna 76 , and the folder sensor 77 are not limited to the above, but shown for convenience of explanation. That is, the reception speaker 74 may be fitted to the lower casing 72 , both the transmission speaker 75 and the antenna 76 may be fitted to the upper casing 71 , and the magnet and the magnetic sensor in the folder sensor may exchange their positions in the lower and upper casings 72 and 71 .
- the manufacturer of the portable radio telephone stores voltages for optimal antenna impedance matching both in a case opened condition and case closed condition to the non-volatile memory 31 .
- the folder sensor 20 or 77 shown in FIG. 1 or 5 senses the upper casing 71 and the lower casing 72 of the portable radio telephone being in a closed state or an opened state, and informs the CPU 30 . That is, the folder sensor 20 or 77 having a permanent magnet and a magnetic sensor senses states of the casings by the magnetic sensor, and informs the states to the CPU 30 .
- the CPU 30 recognizes the casing states sensed at the folder senor 20 , and reads the data stored in the non-volatile memory 31 according to the casing state, to control the DAC 40 to provide a predetermined control voltage, and the DAC 40 controls impedance matching of the matching circuit 50 under the control of the CPU 30 .
- the CPU 30 controls the variable pulse generator 41 in the DAC 40 to provide pulses with relatively small widths or with relatively low densities, to generate a control voltage, for example 1V, and provide it to the matching circuit 50
- the CPU 30 controls the variable pulse generator 41 in the DAC 40 to provide pulses with relatively large widths or with relatively high densities, to generate a control voltage, for example 3V, and provide it to the matching circuit 50
- the matching circuit 50 adjusts a capacitance to achieve an optimal impedance matching when the matching circuit 50 transfers a transmission/reception signal between the antenna 10 and the transmission/reception circuit 60 according to the control voltage from the DAC 40 .
- variable capacitance diode, or varactor, C 3 has a capacitance varied with the control voltage from the DAC 40 ; i.e., if the control voltage from the DAC 40 is high, the capacitance is also great.
- an overall impedance matching for the inductor L, the first capacitor C 1 , the second capacitor C 2 , and the variable capacitance diode, or varactor, C 3 is adjusted by varying the capacitance of the variable capacitance diode, or varactor, C 3 depending on the state of the casing, for achieving an optimal impedance matching according to the casing state when the matching circuit 50 transfers a transmission/reception signal between the antenna 10 and the transmission/reception circuit 60 .
- the difference between the matching circuits 50 is whether the second capacitor C 2 and the variable capacitance diode, or varactor, C 3 are connected in series or parallel. Therefore, an equivalent capacitance of the second capacitor C 2 and the variable capacitance diode, or varactor, C 3 is varied with a state of the variable capacitance diode, or varactor, C 3 .
- FIG. 6 illustrates a block diagram of a device for matching an antenna impedance in a portable radio telephone in accordance with a second preferred embodiment
- FIG. 7A illustrates an outer appearance of a device for matching an antenna impedance in a portable radio telephone in accordance with a second preferred embodiment
- FIG. 7B illustrates a circuit of the CPU and the antenna sensor in FIG. 7A .
- the device for matching an antenna impedance in a portable radio telephone in accordance with a second preferred embodiment includes an antenna 10 , an antenna sensor 80 , a CPU 30 , a DAC 40 , a matching circuit 50 , a transmission/reception circuit 60 , and a non-volatile memory 31 .
- the antenna sensor 80 senses the antenna 10 being extracted out of the case or retracted into the casing.
- the rest of the parts in FIG. 6 have functions the same as the first embodiment, but the CPU 30 provides a control signal for controlling a voltage in response to a signal from the antenna sensor 80 , in lieu of the folder sensor 20 .
- the antenna sensor 80 is fitted to a low portion of an antenna line for sensing whether the antenna of the portable radio is in a retracted state in which the antenna is pushed into the portable radio telephone, or in an extracted state in which the antenna is pulled out of the portable radio telephone. The sensor then provides an indication of the state of the antenna to the CPU 30 .
- the antenna sensor 80 has a micro tact switch, or the like. A position of the antenna sensor 80 is not limited to the position shown in FIG. 7A , which is shown as an example for convenience of explanation, and may be fitted to a top portion of the antenna line.
- Voltage values for optimal antenna impedance matching for respective antenna states are stored in the non-volatile memory 31 .
- the antenna sensor 80 senses an antenna state either being extracted or retracted, and informs the CPU 30 . That is, if the antenna in the portable radio telephone is retracted into the portable radio telephone, so as to turn on the antenna sensor 80 , a logic low signal is provided to the CPU 30 . And, if the antenna in the portable radio telephone is extracted from the portable radio telephone, to turn off the antenna sensor 80 , a logic high signal is provided to the CPU 30 , due to a pull-up resistance R.
- the CPU 30 recognizes the antenna state sensed at the antenna sensor 80 , and reads the data stored in the non-volatile memory 31 according to the antenna state, and controls the DAC 40 to vary the control voltage, and the DAC 40 controls impedance matching of the matching circuit 50 under the voltage control of the CPU 30 .
- the matching circuit 50 adjusts a capacitance so that an optimal impedance matching can be achieved when the matching circuit 50 transfers a transmission/reception signal between the antenna 10 and the transmission/reception circuit 60 .
- FIG. 8 illustrates a block diagram of a device for matching an antenna impedance in a portable radio telephone in accordance with a third preferred embodiment.
- the device for matching an antenna impedance in a portable radio telephone in accordance with a third preferred embodiment includes an antenna 10 , a folder sensor 20 , an antenna sensor 80 , a CPU 30 , a DAC 40 , a matching circuit 50 , a transmission/reception circuit 60 , and a non-volatile memory 31 .
- the folder sensor 20 senses a folded or unfolded state of a telephone casing
- the antenna sensor 80 senses whether the antenna is extracted or retracted from/to the telephone, and respectively informs the CPU 30 .
- the non-volatile memory 31 stores voltage values for optimal antenna impedance matching according to casing states and antenna states.
- the CPU 30 determines the casing and antenna states from the folder sensor 20 and the antenna sensor 80 , respectively. That is, the CPU 30 : determines a state wherein the casing is opened and the antenna is extracted, a state wherein the casing is opened and the antenna is retracted, a state wherein the casing is closed and the antenna is extracted, and a state wherein the casing is closed and the antenna is retracted; reads data from the non-volatile memory 31 according to the determined state; and provides a corresponding voltage for each state. That is, voltages which can provide impedances proper to each of the states are stored in the non-volatile memory 31 , and one of which is forwarded. That is, the voltages for the casing and antenna states are as shown in table 1, below. casing antenna voltage casing antenna voltage closed extracted V1 closed retracted V2 opened extracted V3 opened retracted V4 Fourth Embodiment
- FIG. 9 illustrates a block diagram of a device for matching an antenna impedance in a portable radio telephone in accordance with a fourth preferred embodiment.
- Variables in the antenna impedance matching of a portable radio telephone such as, not only the opened or closed state of the casing and the antenna extraction/retraction states, but also telephone transmission and reception states, and optimal matching values according to the above conditions for a specific telephone set, may differ, therefore, the above conditions should be taken into account for an optimal matching of the antenna impedance.
- a device for matching an antenna impedance in a portable radio telephone which can perform an optimal antenna impedance matching even in the above conditions.
- the device for matching an antenna impedance in a portable radio telephone in accordance with a fourth preferred embodiment includes an antenna 10 , a folder sensor 20 , an antenna sensor 80 , a CPU 30 , a DAC 40 , a matching circuit 50 , a transmission/reception circuit 60 , a measurement device 90 , a Personal Computer (PC) 100 , a Universal Asynchronous Receiver/Transmitter (UART) 110 .
- the folder sensor 20 senses a folded or unfolded state of a telephone casing
- the antenna sensor 80 senses the antenna being extracted or retracted from/to the telephone set, and respectively informs the CPU 30 .
- the PC 100 stores control signals for measuring frequencies transmitted/received through the antenna, and optimal data values under the above conditions, and the measurement device 90 has an antenna coupler 120 coupled to the antenna 10 for providing an RF signal having a frequency to the antenna 10 or measuring an RF frequency provided from the antenna.
- the CPU 30 determines the casing and antenna states from the folder sensor 20 and the antenna sensor 80 respectively; receives an RF signal through the antenna 10 and the transmission/reception circuit 60 ; boosts the DAC output voltage by a 0.5V increment from 0V to a certain level (255V) gradually to vary the antenna impedance matching; measures a Rx reception sensitivity; and provides the reception sensitivity to the PC 100 through the UART 110 every time the antenna matching impedance is varied. And, upon determination of an optimal antenna impedance matching value, the CPU 30 stores the optimal antenna impedance matching value to the non-volatile memory 31 .
- the CPU 30 In a transmission mode, under the control of the PC 100 , the CPU 30 : boosts the DAC output voltage by a 0.5V increment from 0V to a certain level (255V) gradually to vary the antenna impedance matching; causing the PC 100 to measure the Tx transmission level every time the antenna impedance matching is varied; and, upon reception of the optimal antenna impedance matching from the PC 100 , the CPU 30 stores the optimal antenna impedance matching to the non-volatile memory 31 .
- the CPU 30 can store optimal antenna impedance matching values for the states wherein the casing is opened and the antenna is extracted, the casing is opened and the antenna is retracted, the casing is closed and the antenna is extracted, and the casing is closed and the antenna is retracted, and for a reception mode and a transmission mode, and provides different control voltages depending on the states. That is, the CPU 30 stores voltages which can provide impedances proper to respective states in the memory 31 , and forwards one of the voltages.
- FIG. 10 illustrates a flow chart showing a preferred embodiment method for storing an optimal antenna impedance matching value for a reception mode in a fourth preferred embodiment.
- a reception mode When the casing is closed, the antenna is retracted, and the radio telephone is in a reception mode (1S and 2S), a method for setting an optimal antenna impedance matching value will be explained. That is, in the reception mode, the measurement device 90 is controlled through the PC 100 , such that the measurement device 90 provides an RF signal with a frequency matching the center frequency of the reception band (Rx band) of the portable radio telephone. When the measurement device 90 provides the RF signal, the RF signal is provided to the antenna 10 by the antenna coupler 120 (3S).
- the CPU 30 while receiving the RF signal through the antenna 10 , the matching circuit 50 , and the transmission/reception circuit 60 , boosts the DAC output voltage by a 0.5V increment from 0V to a certain level (255V) gradually, to vary the antenna impedance matching, and measures a Rx reception sensitivity and provides the reception sensitivity to the PC 100 through the UART 110 every time the antenna impedance matching is varied (4S).
- the PC 100 forms a table of the Rx reception sensitivity measurement results, and commands the CPU 30 to store a DAC voltage value corresponding to the Rx reception value (5S) of the best sensitivity, and the CPU 30 stores the voltage value at a relevant table position of the memory 31 (for example, Rx_center_fold_DAC), and terminates a reception call (6S).
- the CPU 30 adjusts the matching circuit 50 with reference to the value when the casing is closed, the antenna is retracted, and the radio telephone is in the reception mode.
- the Rx reception sensitivity measurement results are formed into tables for the states wherein the casing is closed and the antenna is retracted, the casing is opened and the antenna is retracted, and the casing is opened and the antenna is extracted.
- DAC voltage values corresponding to Rx reception values of the best sensitivity for each case are stored at relevant table positions of the non-volatile memory 31 , and reception calls are terminated.
- the measurements may be made to provide a high frequency or a low frequency of the reception band, and, by the same method, the Rx reception sensitivity measurement results are stored into tables, DAC voltage values corresponding to Rx reception values of the best sensitivity for each case are stored at relevant table positions of the non-volatile memory 31 , and the values may be used in the antenna impedance matching.
- FIG. 11 illustrates a flow chart showing a preferred embodiment method for storing an optimal antenna impedance matching value for a reception mode in a fourth preferred embodiment.
- the measurement device 90 is controlled through the PC 100 , such that the measurement device 90 measures the RF signal from the antenna 10 in the portable radio telephone (13S).
- the PC 100 controls the CPU 30 through the UART 110 , such that the CPU 30 controls the transmission/reception circuit to transmit at a center frequency of the transmission band (Tx band).
- the CPU 30 boosts the DAC output voltage by a 0.5V increment from 0V to a certain level (255V) gradually, to vary the antenna impedance matching, and provides a voltage value to the PC 100 through the UART 110 every time the antenna impedance matching is varied (14S).
- the PC 100 stores the Tx output level measurement from the measurement device 90 into a table, and commands the CPU 30 to store a DAC voltage value corresponding to Tx reception value (15S) of the best output level, and the CPU 30 stores the voltage value at a relevant table position of the memory 31 (for example, Tx_center_fold_DAC), and terminates a transmission call (16S).
- the CPU 30 adjusts the matching circuit 50 with reference to the value in the case wherein the casing is closed, the antenna is retracted, and the radio telephone is in the transmission mode.
- resultants of the Tx transmission sensitivity measurement are stored into tables for-the states wherein the casing is closed and the antenna is extracted, the casing is opened and the antenna is retracted, and the casing is opened and the antenna is extracted.
- DAC voltage values corresponding to Tx transmission values of the best output level for each case are stored at relevant table positions of the non-volatile memory 31 , and a transmission call is terminated.
- the CPU 30 may be made to control the transmission/reception circuit to provide a high frequency or a low frequency of the transmission band Tx band, and, by the same method, Tx transmission sensitivity measurement results are stored into tables, DAC voltage values corresponding to Tx transmission values of the best output level for each case are stored at relevant table positions of the non-volatile memory 31 , and the values may be used in the antenna impedance matching.
- the DAC output voltages stored in the non-volatile memory according to the method for the optimal antenna impedance matching are as shown on table 2 , below.
- the CPU 30 identifies transmission/reception modes, and a folder casing state and an antenna state from respective sensors, reads the pertinent data, and adjusts a matching value.
- the device for matching an antenna impedance in a portable radio telephone as described herein has the following advantages.
- the antenna impedance matching with an optimal value according to the casing state by sensing a folded or unfolded state of the portable radio telephone, permits enhanced radio performance.
- the antenna impedance matching with an optimal value according to the antenna state by sensing an extracted or retracted state of the antenna in the portable radio telephone, permits enhanced radio performance.
- the antenna impedance matching with an optimal value according to both the casing state and the antenna state by sensing the casing state and the antenna state of the portable radio telephone, permits enhanced radio performance.
- the antenna impedance matching with an optimal value according to the mode state, the casing state, and the antenna state by sensing the mode state, the casing state and the antenna state of the portable radio telephone, permits enhanced radio performance.
Abstract
Description
- This application claims the benefit of Korean patent application No. 1999-30587, filed on Jul. 27, 1999, the entirety of which is hereby incorporated by reference for all purposes as if fully set forth herein.
- 1. Field of the Invention
- The present invention relates to a device for matching an antenna impedance in a portable radio telephone, and more particularly, to a device for matching an antenna impedance in a portable radio telephone, for maintaining an optimal antenna impedance matching state.
- 2. Background of the Related Art
- The portable radio telephone of a folder type, or a type similar to the folder type, is provided with an upper casing and a lower casing for protecting a display and a keypad. Since an antenna related impedance is varied with the state of the casing, (i.e., a folded or closed state and an unfolded or open state), the radio performance characteristics also vary. That is, the radio performance of the portable radio telephone is dependent on the state of the casing. An example of such a portable radio telephone is disclosed in U.S. Pat. No. 5,335,368, wherein a portable radio telephone having a casing is disclosed which maintains a matched state for the antenna impedance in a call waiting state and in an operating state. The portable radio telephone is provided with an upper casing and a lower casing foldably coupled to a body by hinges, a matching circuit between the antenna and a transmitting-and-receiving circuit, and a sensor (a switch) for sensing states (folded or unfolded) of the upper casing and the lower casing for changing an impedance matching state according to a power provided to the sensor.
- However, the foregoing device for matching an antenna impedance has the following problem.
- First, in the related art, sensors switched mechanically are used for sensing folding and unfolding of the upper casing and the lower casing and matching an impedance of the antenna. Therefore, the sensor is sensitive to mechanical defects, and no antenna related impedance matching dependent on the casing state is possible if mechanical defects occur.
- Second, the antenna impedance matching in the related art cannot match the antenna impedance optimally for both when the antenna is extracted and when it is retracted.
- Third, the antenna impedance matching in the related art only by sensing the casing state cannot match the antenna impedance optimally for both a reception and a transmission mode.
- Accordingly, the present invention is directed to a device for matching an antenna impedance in a portable radio telephone that substantially obviates one or more of the problems due to limitations and disadvantages of the related art.
- An object of the present invention is to provide a device for matching an antenna impedance in a portable radio telephone of a folder type, or a type similar to the folder type, in which an operating mode, a casing state, and an antenna state of the portable radio telephone are detected for matching an optimal antenna related impedance according to respective states.
- Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
- To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described, the device for matching an antenna impedance in a portable radio telephone includes a folder sensor for sensing a folded state or an unfolded state of the folder casing, a controller for controlling a voltage according to a casing state sensed at the folder sensor, and a matching circuit having a variable capacitance diode for matching an impedance of the antenna and an impedance of a transmission/reception circuit according to the voltage of the controller.
- In another aspect of the present invention, there is provided a device for matching an antenna impedance in a portable radio telephone including a radio having transmission and reception circuits, an antenna movable between an extracted position from the telephone and a retracted position into the telephone, means for sensing the extracted or retracted state of the antenna to provide a sensing signal, a controller for providing voltages different from one another in response to the sensing signal from the means, and means for matching an impedance of the antenna and an impedance of the radio according to the voltages from the controller.
- In other aspect of the present invention, there is provided a device for matching an antenna impedance in a portable radio telephone including a radio having transmission and receiving circuits, a foldable casing enclosing the radio, the foldable casing movable between an unfolded position and a folded position, an antenna movable between an extracted position from the foldable casing and a retracted position into the foldable casing, means for sensing whether the foldable casing is in the unfolded position and for sensing whether the antenna is in the extracted position, and for providing a sensing signal in response thereto, and means for matching an impedance of the antenna and an impedance of the radio in response to the sensing signal.
- In a further aspect of the present invention, there is provided a device for matching an antenna impedance in a portable radio telephone, including a radio having transmission and receiving circuits, a foldable casing enclosing the radio, the foldable casing movable between an unfolded position and a folded position, an antenna movable between an extracted position from the foldable casing and a retracted position into the foldable casing, means for sensing whether the foldable casing is in the unfolded position and for sensing whether the antenna is in the extracted position, and for providing a sensing signal in response thereto, a measure for providing a RF signal to the antenna, or measuring a RF signal from the antenna, a controller for controlling the measure to provide the RF signal to the antenna in a reception mode and to measure the RF signal from the antenna in a transmission mode, and for determining optimal antenna impedance matching values for respective modes and folder casing and antenna states and storing the optimal matching values, and means for matching an impedance of the antenna and an impedance of the radio in response to the sensing signal in actual use by, under the control of the controller, boosting a voltage by a fixed increment from 0V to a fixed level for every folder casing state, antenna state, transmission and reception mode condition to vary an antenna impedance matching, for the controller to measure a transmission or reception sensitivity every time the antenna impedance matching is varied, to set an optimal antenna impedance matching value for each of the states, and to store the optimal antenna impedance matching values therein.
- It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.
- The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention:
- In the drawings:
-
FIG. 1 illustrates a block diagram of a device for matching an antenna impedance in a portable radio telephone in accordance with a first preferred embodiment; -
FIG. 2 illustrates a detailed system of the digital-to-analog converter (DAC) inFIG. 1 ; -
FIG. 3 illustrates a detailed system of the matching circuit inFIG. 1 ; -
FIG. 4 illustrates a detailed system of the matching circuit inFIG. 1 in accordance with a second preferred embodiment; -
FIG. 5 illustrates an outer appearance of a portable radio telephone in accordance with a first preferred embodiment; -
FIG. 6 illustrates a block diagram of a device for matching an antenna impedance in a portable radio telephone in accordance with a second preferred embodiment; -
FIG. 7A illustrates an outer appearance of a device for matching an antenna impedance in a portable radio telephone in accordance with a second preferred embodiment; -
FIG. 7B illustrates a circuit of the CPU and the antenna sensor inFIG. 7A ; -
FIG. 8 illustrates a block diagram of a device for matching an antenna impedance in a portable radio telephone in accordance with a third preferred embodiment; -
FIG. 9 illustrates a block diagram of a device for matching an antenna impedance in a portable radio telephone in accordance with a fourth preferred embodiment; -
FIG. 10 illustrates a flow chart showing a first embodiment method for storing an optimal antenna impedance matching value in accordance with a fourth preferred embodiment; and,FIG. 11 illustrates a flow chart showing a second embodiment method for storing an optimal antenna impedance matching value in accordance with a fourth preferred embodiment. - Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings.
- First Embodiment
-
FIG. 1 illustrates a block diagram of a device for matching an antenna impedance in a portable radio telephone in accordance with a first preferred embodiment. - Referring to
FIG. 1 , the device for matching an antenna impedance in a portable radio telephone in accordance with a first preferred embodiment includes anantenna 10, afolder sensor 20, a central processing unit (CPU) 30, a Digital-to-Analog Converter (DAC) 40, amatching circuit 50, transmission/reception circuit 60, and anon-volatile memory 31. Theantenna 10 receives a radio wave signal from the air and provides the signal to amatching circuit 50, or transmits a signal from the matchingcircuit 50 to the air. Thefolder sensor 20 has a permanent magnet and a magnetic sensor for sensing a folded or unfolded state of a casing of the portable radio telephone, and communicating the state to theCPU 30. Thenon-volatile memory 31 stores a voltage value corresponding to a state of the folder sensor, and theCPU 30 reads the stored voltage value from thenon-volatile memory 31 according to a state that thefolder sensor 20 senses. TheDAC 40 converts a voltage from theCPU 30 into analog signal for controlling matching of the matchingcircuit 50. A detailed embodiment of the DAC is illustrated inFIG. 2 . - That is, the DAC has a variable pulse generator, which may be a Pulse Width Modulator (PWM) or a Pulse Density Modulator (PDM), for receiving a control signal and a data signal from the
CPU 30 and varying a pulse width or a pulse density, and aintegrating circuit 42 having a resistor R and a capacitor C for integrating a signal from thevariable pulse generator 41 and providing it to the matching circuit 5. Accordingly, under the control of theCPU 30, if the pulse width from thevariable pulse generator 41 is relatively large or the pulse density therefrom is relatively high, a high DC control voltage is provided, and if relatively small or relatively low, a low DC control voltage is provided. Thematching circuit 50 is directly connected to theantenna 10 for performing impedance matching when a transmission/reception signal is transmitted between theantenna 10 and the transmission/reception circuit 60. The transmission/reception circuit 60 processes a signal received through thematching circuit 50, or provides a signal to theantenna 10 through thematching circuit 50. - A first
embodiment matching circuit 50 is as shown inFIG. 3 .FIG. 3 illustrates a detailed system of the first embodiment matching circuit inFIG. 1 . - Referring to
FIG. 3 , thematching circuit 50 comprises a ‘π’ circuit, inclusive of an inductor L1 between theantenna 10 and the transmission/reception circuit 60, a first capacitor C1 connected between the transmission/reception circuit 60/inductor L1 and ground, and a second capacitor C2 and a variable capacitance diode, or varactor, C3 connected in series between theantenna 10/inductor L1 and ground. TheDAC 40 is connected between the second capacitor C2 and the variable capacitance diode, or varactor, C3. Therefore, a capacitance of the variable capacitance diode, or varactor, C3 is varied with a control voltage from theDAC 40. - In the meantime, a second
embodiment matching circuit 50 is as shown inFIG. 4 .FIG. 4 illustrates a detailed system of the second embodiment of the matchingcircuit 50 inFIG. 1 . - Referring to
FIG. 4 , the matchingcircuit 50 comprises a ‘π’ circuit, inclusive of an inductor L1 between theantenna 10 and the transmission/reception circuit 60, a first capacitor C1 connected between the transmission/reception circuit 60/inductor L1 and ground, and a second capacitor C2 and a variable capacitance diode, or varactor, C3 each respectively connected between theantenna 10/inductor L1 and ground. TheDAC 40 is connected between the inductor L1 and the variable capacitance diode, or varactor, C3. Therefore, a capacitance of the variable capacitance diode, or varactor, C3 is varied with a control voltage from theDAC 40.FIG. 5 illustrates an outer appearance of a portable radio telephone in accordance with a first preferred embodiment. - Referring to
FIG. 5 , the outer appearance of a portable radio telephone in accordance with a first preferred embodiment of the present invention shows anupper casing 71 and alower casing 72, both of which are foldably coupled with ahinge 73. There is areception speaker 74 in theupper casing 71 and atransmission speaker 75 and anantenna 76 in the lower casing. There is afolder sensor 77 fitted to thelower casing 72 for detecting a folded or unfolded state of theupper casing 71 and thelower casing 72. That is, thefolder sensor 77 has a permanent magnet fitted to a position of theupper casing 71, and a magnetic sensor fitted to thelower casing 72 at a position opposite to the permanent magnet in theupper casing 71. Positions of thereception speaker 74, thetransmission speaker 75, theantenna 76, and thefolder sensor 77 are not limited to the above, but shown for convenience of explanation. That is, thereception speaker 74 may be fitted to thelower casing 72, both thetransmission speaker 75 and theantenna 76 may be fitted to theupper casing 71, and the magnet and the magnetic sensor in the folder sensor may exchange their positions in the lower andupper casings - The operation of the aforementioned device for matching an antenna impedance in accordance with a first preferred embodiment will be explained.
- The manufacturer of the portable radio telephone stores voltages for optimal antenna impedance matching both in a case opened condition and case closed condition to the
non-volatile memory 31. Thefolder sensor FIG. 1 or 5 senses theupper casing 71 and thelower casing 72 of the portable radio telephone being in a closed state or an opened state, and informs theCPU 30. That is, thefolder sensor CPU 30. Then, theCPU 30 recognizes the casing states sensed at thefolder senor 20, and reads the data stored in thenon-volatile memory 31 according to the casing state, to control theDAC 40 to provide a predetermined control voltage, and theDAC 40 controls impedance matching of the matchingcircuit 50 under the control of theCPU 30. For example, if the casing is closed, theCPU 30 controls thevariable pulse generator 41 in theDAC 40 to provide pulses with relatively small widths or with relatively low densities, to generate a control voltage, for example 1V, and provide it to thematching circuit 50, and, conversely, if the casing is opened, theCPU 30 controls thevariable pulse generator 41 in theDAC 40 to provide pulses with relatively large widths or with relatively high densities, to generate a control voltage, for example 3V, and provide it to thematching circuit 50. According to this, the matchingcircuit 50 adjusts a capacitance to achieve an optimal impedance matching when the matchingcircuit 50 transfers a transmission/reception signal between theantenna 10 and the transmission/reception circuit 60 according to the control voltage from theDAC 40. That is, with reference toFIGS. 3 and 4 , the variable capacitance diode, or varactor, C3 has a capacitance varied with the control voltage from theDAC 40; i.e., if the control voltage from theDAC 40 is high, the capacitance is also great. In other words, an overall impedance matching for the inductor L, the first capacitor C1, the second capacitor C2, and the variable capacitance diode, or varactor, C3 is adjusted by varying the capacitance of the variable capacitance diode, or varactor, C3 depending on the state of the casing, for achieving an optimal impedance matching according to the casing state when the matchingcircuit 50 transfers a transmission/reception signal between theantenna 10 and the transmission/reception circuit 60. In this instance, inFIGS. 3 and 4 , the difference between the matchingcircuits 50 is whether the second capacitor C2 and the variable capacitance diode, or varactor, C3 are connected in series or parallel. Therefore, an equivalent capacitance of the second capacitor C2 and the variable capacitance diode, or varactor, C3 is varied with a state of the variable capacitance diode, or varactor, C3. - SECOND EMBODIMENT
- A device for matching an antenna impedance in a portable radio telephone in accordance with a second preferred embodiment will be explained.
FIG. 6 illustrates a block diagram of a device for matching an antenna impedance in a portable radio telephone in accordance with a second preferred embodiment,FIG. 7A illustrates an outer appearance of a device for matching an antenna impedance in a portable radio telephone in accordance with a second preferred embodiment, andFIG. 7B illustrates a circuit of the CPU and the antenna sensor inFIG. 7A . - Referring to
FIG. 6 , the device for matching an antenna impedance in a portable radio telephone in accordance with a second preferred embodiment includes anantenna 10, anantenna sensor 80, aCPU 30, aDAC 40, a matchingcircuit 50, a transmission/reception circuit 60, and anon-volatile memory 31. Theantenna sensor 80 senses theantenna 10 being extracted out of the case or retracted into the casing. And, the rest of the parts inFIG. 6 have functions the same as the first embodiment, but theCPU 30 provides a control signal for controlling a voltage in response to a signal from theantenna sensor 80, in lieu of thefolder sensor 20. - An outer appearance of a device for matching an antenna impedance in a portable radio telephone in accordance with a second preferred embodiment will be explained.
- Referring to
FIG. 7A , theantenna sensor 80 is fitted to a low portion of an antenna line for sensing whether the antenna of the portable radio is in a retracted state in which the antenna is pushed into the portable radio telephone, or in an extracted state in which the antenna is pulled out of the portable radio telephone. The sensor then provides an indication of the state of the antenna to theCPU 30. As shown inFIG. 7B , theantenna sensor 80 has a micro tact switch, or the like. A position of theantenna sensor 80 is not limited to the position shown inFIG. 7A , which is shown as an example for convenience of explanation, and may be fitted to a top portion of the antenna line. - The operation of the device for matching an antenna impedance in accordance with a second preferred embodiment will be explained.
- Voltage values for optimal antenna impedance matching for respective antenna states are stored in the
non-volatile memory 31. And, as shown inFIGS. 6, 7A and 7B, theantenna sensor 80 senses an antenna state either being extracted or retracted, and informs theCPU 30. That is, if the antenna in the portable radio telephone is retracted into the portable radio telephone, so as to turn on theantenna sensor 80, a logic low signal is provided to theCPU 30. And, if the antenna in the portable radio telephone is extracted from the portable radio telephone, to turn off theantenna sensor 80, a logic high signal is provided to theCPU 30, due to a pull-up resistance R. Accordingly, theCPU 30 recognizes the antenna state sensed at theantenna sensor 80, and reads the data stored in thenon-volatile memory 31 according to the antenna state, and controls theDAC 40 to vary the control voltage, and theDAC 40 controls impedance matching of the matchingcircuit 50 under the voltage control of theCPU 30. And, as explained, the matchingcircuit 50 adjusts a capacitance so that an optimal impedance matching can be achieved when the matchingcircuit 50 transfers a transmission/reception signal between theantenna 10 and the transmission/reception circuit 60. - Third Embodiment
- A device for matching an antenna impedance in a portable radio telephone in accordance with a third preferred embodiment will be explained.
FIG. 8 illustrates a block diagram of a device for matching an antenna impedance in a portable radio telephone in accordance with a third preferred embodiment. - Referring to
FIG. 8 , the device for matching an antenna impedance in a portable radio telephone in accordance with a third preferred embodiment includes anantenna 10, afolder sensor 20, anantenna sensor 80, aCPU 30, aDAC 40, a matchingcircuit 50, a transmission/reception circuit 60, and anon-volatile memory 31. Thefolder sensor 20 senses a folded or unfolded state of a telephone casing, theantenna sensor 80 senses whether the antenna is extracted or retracted from/to the telephone, and respectively informs theCPU 30. Thenon-volatile memory 31 stores voltage values for optimal antenna impedance matching according to casing states and antenna states. TheCPU 30 determines the casing and antenna states from thefolder sensor 20 and theantenna sensor 80, respectively. That is, the CPU 30: determines a state wherein the casing is opened and the antenna is extracted, a state wherein the casing is opened and the antenna is retracted, a state wherein the casing is closed and the antenna is extracted, and a state wherein the casing is closed and the antenna is retracted; reads data from thenon-volatile memory 31 according to the determined state; and provides a corresponding voltage for each state. That is, voltages which can provide impedances proper to each of the states are stored in thenon-volatile memory 31, and one of which is forwarded. That is, the voltages for the casing and antenna states are as shown in table 1, below. casing antenna voltagecasing antenna voltage closed extracted V1 closed retracted V2 opened extracted V3 opened retracted V4
Fourth Embodiment - A device for matching an antenna impedance in a portable radio telephone in accordance with a fourth preferred embodiment will be explained.
FIG. 9 illustrates a block diagram of a device for matching an antenna impedance in a portable radio telephone in accordance with a fourth preferred embodiment. Variables in the antenna impedance matching of a portable radio telephone, such as, not only the opened or closed state of the casing and the antenna extraction/retraction states, but also telephone transmission and reception states, and optimal matching values according to the above conditions for a specific telephone set, may differ, therefore, the above conditions should be taken into account for an optimal matching of the antenna impedance. That is, since the operating frequency differs between a reception mode and a transmission mode, and every telephone set has its own optimal matching value, an optimal matching for the casing states and the antenna states under the above conditions is required. Therefore, in the fourth embodiment, a device is suggested for matching an antenna impedance in a portable radio telephone which can perform an optimal antenna impedance matching even in the above conditions. - Referring to
FIG. 9 , the device for matching an antenna impedance in a portable radio telephone in accordance with a fourth preferred embodiment includes anantenna 10, afolder sensor 20, anantenna sensor 80, aCPU 30, aDAC 40, a matchingcircuit 50, a transmission/reception circuit 60, ameasurement device 90, a Personal Computer (PC) 100, a Universal Asynchronous Receiver/Transmitter (UART) 110. Thefolder sensor 20 senses a folded or unfolded state of a telephone casing, theantenna sensor 80 senses the antenna being extracted or retracted from/to the telephone set, and respectively informs theCPU 30. ThePC 100 stores control signals for measuring frequencies transmitted/received through the antenna, and optimal data values under the above conditions, and themeasurement device 90 has anantenna coupler 120 coupled to theantenna 10 for providing an RF signal having a frequency to theantenna 10 or measuring an RF frequency provided from the antenna. In a reception mode, under the control of thePC 100, the CPU 30: determines the casing and antenna states from thefolder sensor 20 and theantenna sensor 80 respectively; receives an RF signal through theantenna 10 and the transmission/reception circuit 60; boosts the DAC output voltage by a 0.5V increment from 0V to a certain level (255V) gradually to vary the antenna impedance matching; measures a Rx reception sensitivity; and provides the reception sensitivity to thePC 100 through theUART 110 every time the antenna matching impedance is varied. And, upon determination of an optimal antenna impedance matching value, theCPU 30 stores the optimal antenna impedance matching value to thenon-volatile memory 31. In a transmission mode, under the control of thePC 100, the CPU 30: boosts the DAC output voltage by a 0.5V increment from 0V to a certain level (255V) gradually to vary the antenna impedance matching; causing thePC 100 to measure the Tx transmission level every time the antenna impedance matching is varied; and, upon reception of the optimal antenna impedance matching from thePC 100, theCPU 30 stores the optimal antenna impedance matching to thenon-volatile memory 31. According to this method, theCPU 30 can store optimal antenna impedance matching values for the states wherein the casing is opened and the antenna is extracted, the casing is opened and the antenna is retracted, the casing is closed and the antenna is extracted, and the casing is closed and the antenna is retracted, and for a reception mode and a transmission mode, and provides different control voltages depending on the states. That is, theCPU 30 stores voltages which can provide impedances proper to respective states in thememory 31, and forwards one of the voltages. - A method for matching an antenna impedance in a radio telephone in accordance with a fourth preferred embodiment will be explained.
FIG. 10 illustrates a flow chart showing a preferred embodiment method for storing an optimal antenna impedance matching value for a reception mode in a fourth preferred embodiment. - First, a reception mode will be explained. When the casing is closed, the antenna is retracted, and the radio telephone is in a reception mode (1S and 2S), a method for setting an optimal antenna impedance matching value will be explained. That is, in the reception mode, the
measurement device 90 is controlled through thePC 100, such that themeasurement device 90 provides an RF signal with a frequency matching the center frequency of the reception band (Rx band) of the portable radio telephone. When themeasurement device 90 provides the RF signal, the RF signal is provided to theantenna 10 by the antenna coupler 120 (3S). Then, theCPU 30, while receiving the RF signal through theantenna 10, the matchingcircuit 50, and the transmission/reception circuit 60, boosts the DAC output voltage by a 0.5V increment from 0V to a certain level (255V) gradually, to vary the antenna impedance matching, and measures a Rx reception sensitivity and provides the reception sensitivity to thePC 100 through theUART 110 every time the antenna impedance matching is varied (4S). Thus, if the antenna impedance matching is varied, thePC 100 forms a table of the Rx reception sensitivity measurement results, and commands theCPU 30 to store a DAC voltage value corresponding to the Rx reception value (5S) of the best sensitivity, and theCPU 30 stores the voltage value at a relevant table position of the memory 31 (for example, Rx_center_fold_DAC), and terminates a reception call (6S). Thus, after the adjusted value is stored at the relevant table position of thenon-volatile memory 31, in actual use, theCPU 30 adjusts the matchingcircuit 50 with reference to the value when the casing is closed, the antenna is retracted, and the radio telephone is in the reception mode. - According to identical methods, the Rx reception sensitivity measurement results are formed into tables for the states wherein the casing is closed and the antenna is retracted, the casing is opened and the antenna is retracted, and the casing is opened and the antenna is extracted. DAC voltage values corresponding to Rx reception values of the best sensitivity for each case are stored at relevant table positions of the
non-volatile memory 31, and reception calls are terminated. - Alternatively, instead of the center frequency of the reception band, the measurements may be made to provide a high frequency or a low frequency of the reception band, and, by the same method, the Rx reception sensitivity measurement results are stored into tables, DAC voltage values corresponding to Rx reception values of the best sensitivity for each case are stored at relevant table positions of the
non-volatile memory 31, and the values may be used in the antenna impedance matching. - A method for setting an optimal antenna impedance matching value in a transmission mode will be explained.
FIG. 11 illustrates a flow chart showing a preferred embodiment method for storing an optimal antenna impedance matching value for a reception mode in a fourth preferred embodiment. - When the casing is opened and the antenna is retracted (11S and 12S), the
measurement device 90 is controlled through thePC 100, such that themeasurement device 90 measures the RF signal from theantenna 10 in the portable radio telephone (13S). And, thePC 100 controls theCPU 30 through theUART 110, such that theCPU 30 controls the transmission/reception circuit to transmit at a center frequency of the transmission band (Tx band). Under this state, theCPU 30 boosts the DAC output voltage by a 0.5V increment from 0V to a certain level (255V) gradually, to vary the antenna impedance matching, and provides a voltage value to thePC 100 through theUART 110 every time the antenna impedance matching is varied (14S). Thus, if theCPU 30 varies, and forwards the antenna impedance matching value, thePC 100 stores the Tx output level measurement from themeasurement device 90 into a table, and commands theCPU 30 to store a DAC voltage value corresponding to Tx reception value (15S) of the best output level, and theCPU 30 stores the voltage value at a relevant table position of the memory 31 (for example, Tx_center_fold_DAC), and terminates a transmission call (16S). Thus, after the adjusted value is stored at the relevant table position of thenon-volatile memory 31, in actual use, theCPU 30 adjusts the matchingcircuit 50 with reference to the value in the case wherein the casing is closed, the antenna is retracted, and the radio telephone is in the transmission mode. - According to identical methods, resultants of the Tx transmission sensitivity measurement are stored into tables for-the states wherein the casing is closed and the antenna is extracted, the casing is opened and the antenna is retracted, and the casing is opened and the antenna is extracted. DAC voltage values corresponding to Tx transmission values of the best output level for each case are stored at relevant table positions of the
non-volatile memory 31, and a transmission call is terminated. - Alternatively, instead of the center frequency of the transmission band, the
CPU 30 may be made to control the transmission/reception circuit to provide a high frequency or a low frequency of the transmission band Tx band, and, by the same method, Tx transmission sensitivity measurement results are stored into tables, DAC voltage values corresponding to Tx transmission values of the best output level for each case are stored at relevant table positions of thenon-volatile memory 31, and the values may be used in the antenna impedance matching. - The DAC output voltages stored in the non-volatile memory according to the method for the optimal antenna impedance matching are as shown on table 2, below. Once the voltage values corresponding to respective states are stored in the
non-volatile memory 31, theCPU 30 identifies transmission/reception modes, and a folder casing state and an antenna state from respective sensors, reads the pertinent data, and adjusts a matching value.Mode of telephone casing antenna output voltage reception mode closed retracted V1 reception mode closed extracted V2 reception mode opened retracted V3 reception mode opened extracted V4 transmission mode closed retracted V5 transmission mode closed extracted V6 transmission mode opened retracted V7 transmission mode opened extracted V8 - As has been explained, the device for matching an antenna impedance in a portable radio telephone as described herein has the following advantages.
- First, the antenna impedance matching with an optimal value according to the casing state, by sensing a folded or unfolded state of the portable radio telephone, permits enhanced radio performance.
- Second, the antenna impedance matching with an optimal value according to the antenna state, by sensing an extracted or retracted state of the antenna in the portable radio telephone, permits enhanced radio performance.
- Third, the antenna impedance matching with an optimal value according to both the casing state and the antenna state, by sensing the casing state and the antenna state of the portable radio telephone, permits enhanced radio performance.
- Fourth, the antenna impedance matching with an optimal value according to the mode state, the casing state, and the antenna state, by sensing the mode state, the casing state and the antenna state of the portable radio telephone, permits enhanced radio performance.
- It will be apparent to those skilled in the art that various modifications and variations can be made in the device for matching an antenna impedance in a portable radio telephone of the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
Claims (21)
Priority Applications (1)
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US11/039,881 US7983626B2 (en) | 1999-07-27 | 2005-01-24 | Antenna impedance matching device and method for a portable radio telephone |
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KR1019990030587A KR100358444B1 (en) | 1999-07-27 | 1999-07-27 | Antenna Matching Apparatus of Portable Radio Telephone |
US09/627,320 US6862432B1 (en) | 1999-07-27 | 2000-07-27 | Antenna impedance matching device and method for a portable radio telephone |
US11/039,881 US7983626B2 (en) | 1999-07-27 | 2005-01-24 | Antenna impedance matching device and method for a portable radio telephone |
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US11/039,881 Expired - Fee Related US7983626B2 (en) | 1999-07-27 | 2005-01-24 | Antenna impedance matching device and method for a portable radio telephone |
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Also Published As
Publication number | Publication date |
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US7983626B2 (en) | 2011-07-19 |
US6862432B1 (en) | 2005-03-01 |
KR20010011282A (en) | 2001-02-15 |
KR100358444B1 (en) | 2002-10-25 |
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